When sending an e-mail in the standard OS X Mail application a swoosh tone will be played. This tone cannot be disabled through the standard mail settings. With the following defaults write command you can disable the sound.
Launchpad: Change the level of background blur
Launchpad uses a blurred version of your Desktop image as its background. Using cmd + option + ctrl + B while in Launchpad cycles through the original image, the blurred one, a black and white version and a blurred black and white version.
With the following defaults write command you can adjust the blur radius:
Setup a size limit for Time Machine backup volumes
Time Machine will standard use all the available disk space on an external drive or a external server volume. You can setup a limit how much disk space Time Machine may use. Use this defaults write Terminal command:
Stop Safari creating favicon caches
Safari stores favicons in a database named ‘WebpageIcons.db’ located in the folder: ~/Library/Safari/Icons. It is possible to disable the creation of this database with the following command:
Mission Control: Fullsize window previews
In OS X Lion the thumbnail previews of windows from the same app are grouped together. By hovering the mouse over these thumbnails and scrolling up, you can expand the group of windows. It is possible to display these windows in full size.
Activate element inspector in the Mac App store
In the Mac App Store is a hidden element inspector available that lets you view the source of any page or element. It is possible to extract text or images, and adding your own code through the console option.
Enable momentum scrolling for Magic Mouse
The Mouse System Preferences pane does not include an option to enable momentum scrolling. The setting is a hidden preference. Use following command in Terminal to enable momentum scrolling.